Mail 
Findley Lucas
Our code audit, and the fixes
Our code audit, and the fixes
Can I change my username?
Your Aster username is permanent because it is also your email address and encryption identity. Here is why it cannot be renamed, and the two reliable ways to end up with the name you want.
Why Aster won't become the next Skiff
Skiff's shutdown left users scrambling. Here's why Aster is built differently: no investors steering us toward a sale, AGPL code that outlives the company, and standard OpenPGP keys you can take anywhere.
Hi, we're Aster. Here's what we care about.
Aster's mission and the five values we won't trade away: privacy as a right, security that's easy, full open source, no lock-in, and answering to users, not investors. With receipts.
What happens when your subscription ends
A plain explanation of what changes the moment your paid plan ends. What we keep, what gets paused, what you can still do, and how to get back where you were without losing anything.
What does "end-to-end encrypted" really mean
An exact list of what Aster Mail encrypts on your device, what our servers can still see, and an honest explanation of why each piece of metadata exists.
How Aster encrypts your email
A complete, honest look at how Aster encrypts your email — from key derivation and post-quantum protection to the metadata we store in plaintext and why.
Why our storage costs so little
10 GB free and low upgrade prices. Here's the full picture on how we keep storage affordable - the infrastructure decisions, the trade-offs we made, and why this model holds up long-term.
Is Aster Safe If It's Based in the US?
Aster is a US company with servers in Germany. Here's exactly what US law can and can't compel us to hand over - and why client-side encryption means even a valid court order can't get them your emails.
Sustainability Commitments
No venture capital. No advertising. No exit strategy. How Aster is funded, how we're structured, and why we're committed to staying independent. We wrote this to be held against us.
Aster is getting a new look!
We refreshed the Aster Mail logo and visual identity. Here's what changed, what we kept, and the thinking behind every decision in the updated design.
How our warrant canary and transparency report work
What our warrant canary actually proves, what shows up in our transparency report, and how to independently verify both. A practical guide to the legal protections behind Aster Mail.
Introducing Aster Mail: the world's most private email
Aster Mail is here. Free, open source, end-to-end encrypted with post-quantum protection and zero-access architecture. Everything private email should have been from the start.